Knockdown armature.



E. W. PRESBREY.

KNOCKDOWN ARMATURE. APPLICATION FILED MAY 19. 1908. 934,2 1 2. PatentedSept. 14, 1909.

2 SHEETS-SHEET 2.

WITNESSES 'NVENTOH ATTORNEYS,

UNITED STATES PATENT GFFTQE.

EUGENE VIILEY PRESBREY, OF NEW YORK, N. Y.

KNOCKDOVVN ARMATURE.

Patented Sept. 1%, 1989.

1508. Serial No. 433,648.

To all whom it may concern:

Be it known that I, EUGENE WILEY Pens- BREY, a citizen of the UnitedStates, and a resident of the city of New York, borough of Manhattan, inthe county and State of New York, have invented a new and ImprovedKnockdown Armature, of which the following is a full, clear, and exactdescription.

This invention is an improvement in what I preferably term a knockdownarmature, and has in view the provision of a magnetic armature thatshall be reasonably serviceable under all conditions that govern the useof electricity for ignition purposes of internal combustion engines; anarmature that shall deliver a usable current at both high and lowspeeds, without governors or regulators and without danger ofoverheating the coil; an armature that will permit the coils to bewound, insulated and tested outside of the armature; an armature inwhich the coil and core are easily removed or replaced for repair,experiment, or substitution of other coils and cores; an armature coilthat shall because of its construction and relative location have nowire unexposed to the magnetic lines, no dead wire ends, but that shallhave all of its wire uniformly exposed to the magnetic field and thatshall utilize in minimum space the maximum number of magnetic lines; toprovide for taking oif the current in an eflicient manner by a devicethat at the same time compels 5 the armature to run smoothly and withreduced friction, the whole device or devices in combination making forgreater security and convenience, economy in manufacture and ease inmanipulation.

. Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the v1ews.

Figure 1 is a plan of an armature embodying my invention; Fig. 2 is alongitudinal section of the same substantially on the line 2-2 of Fig.1; Fig. 3 is a cross-section on the line 33 of Fig. 1; and Fig. 4: is acrosssection on the line 4i of Fig. 1.

In the preferred construction of the armature I make use of two softiron pole checks 5, 5, longitudinally arranged, spaced apart and securedto non-magnetic metal ends that carry the shaft ends 6, and inconnection with the pole cheeks provide a slotted cylinder for thereception of a coil '7, the slot "providing additional room forventilation. A. core of very thin soft iron 8, tightlysp'nlly rolledinto a solid cylinder accurately fitting between the pole cheeks,furnishes a laminated path from each to the other for the magneticlines. The coil with proper intervening insulation is wound upon thelaminated core, and its diameter is approximately of the width of thepole checks from which it is properly insulated. This coil is fullyprepared and tested before it is assembled in the armature. The coil.and core constitute a perfect solenoid, the mag netic iines firstpassing from every direction across the face of the coil, thenconverging through it by means of the laminated core, and across theopposite face of the coil in passing out. As this coil is woundsynnnctrically. with all its turns parallel, it is obviously in the bestform for the induction of the current. The coil and core are held inplace by means of a single screw 9 which passes through the pole cheeksand core. lVith this screw in place it becomes a part of the core andmagnetic path. An alternating current passes through the non-magneticends to the copper face-plates 10, the latter being separated from saidends by insulating washers 11. The current taken oft by carbon rings 12inclosed in copper shells 13 that also inclose and protect springs 14that hold the carbons in contact with the insulated ends, and at thesame time compel the armature to run smoothly. Each of these springsconsists of two intersecting wire loops which are fastened by suitablemeans, such as screws 15, to two insulating washers 16 bedded in theface of shaft bearings 17. The current is taken from the shells by meansof clips 13 so held as to prevent the carbon rings from turning. Theserings oifer extra large contact, both of carbon and copper, for thecollection and easy delivery of the current and cannot get out of placeor wear unevenly and so disturb the delivery of the current.

The armature is mounted in a field core within permanent magnets, and byreason of the particular arrangement and construction gives a highpotential current of unusually i steady character with a low number ofrevolutions. It is in no danger of burning out its coil at high speed,and consequently it needs no governing or protecting device. Itscapacity can be changed by the removal of the single screw and thesubstitution of another coil of any size of wire that may be desired.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination of soft iron pole cheeks arrangedlongitudinally of and revoluble about a common interi'nediate axis, asoft laminated iron core extending between said pole cheekssubstantially transversely of said axis, a screw extending bet-ween thepole cheeks and through the core, forming a part thereof, and asymmetrical coil wrapped about the core.

2. The combination of soft iron pole cheeks, non-magnetic ends rigidlyattached to the pole cheeks and forming in connection therewith aslotted cylinder, bearings, shaft ends attached to the cylinder ends andournaled in the bearings metallic face-plates surrounding the shaft endsat the outside of the cylinder and insulated therefrom, a generatingcoil arranged in the slot of the cylinder having its terminals connectedwith the metallic face-plates, metallic shells surrounding and insulatedfrom the shaft ends, carbon rings within said shells in contacttherewith, and springs interposed between the bearings and shells,forcing the carbon rings in con tact with the metallic face-plates.

3. The combination of metallic face-plates, of conducting material, agenerating coil having its terminals respectively connected with themetallic face-plates, shells of conducting material arranged adjacent tothe metallic face-plates, and carbon rings in contact with the shellsand metallic faceplates.

at. The combination of shells of conducting material, a generating coilarranged intermediate the shells and revoluble relatively thereto,metallic face-plates in fixed relation to the coil and connected to theterminals thereof, and carbon rings in contact with the face-plates andshells.

5. The combination of shells of conducting material, a generating coilarranged intermediate the shells and revoluble relatively thereto,metallic face-plates in fixed relation to the coil and connected to theterminals thereof, carbon rings fitting within the shells and movablelongitudinally therein, and springs pressing the rings toward thefaceplates.

G. The combination of metallic shells, soft iron pole cheeks, end piecesattached to the pole cheeks and forming in connection therewith aslotted cylinder, bearings, shaft, ends attached to said end pieces ofthe cylinder, passing through the shells and journaled in said bearings,metallic face-plates arranged at the outside of the end pieces andinsulated therefrom and from the shaft ends, a generating coil havingits terminals connected to the face-plates, car bon rings movablelongitudinally within the shells, and an intersecting loop springcarried by and insulated from the bearings and forcing the rings to thefaceplates.

7. The combination of shells of conducting material, a generating coilrevoluble relatively to the shells, having its terminals electricallyconnected to the annular conductors, and conductor rings arranged withinthe shells in contact therewith and in contact with the annularconductors.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EUGENE VH1 Y PRESBREY.

\Vit-nesses W. HOLT, JOHN P. DAVIS.

